ON the sixth anniversary of his son's death, Sean Cassidy never imagined he would be dealing with a whole new ordeal.

But then on Tuesday, as the Cavan native was composing himself for another painful day of reflection, the police phoned his home.

They had new information. Not on his son's death -- Ciaran Cassidy died in the 2005 London bombings -- but on a related issue.

"They said that our telephone number and address is on one of the documents [at the centre of the police investigation]," he said from his home in Islington.

"I don't know what importance I would have been. It was just disbelief."

His phone probably held the same importance as all of the other tapped lines around the UK, the slight promise of a story.

Who's next is anybody's guess as more and more cases come to the fore and the scandal surpasses the worlds of celebrity and politics and begins to affect real people.

Mr Cassidy's details were discovered in the documents of private investigator Glenn Mulcaire, who apologised earlier this week for his actions and who has already spent time behind bars.

As the 'News of the World' spread its fishing exercise, the Cassidys and other families of the July 7 bombings are testament to exactly how low the newspaper was willing to go.

Now, as they try to remember their lost son and brother, they are also thinking about why they find themselves tangled in the tabloid's incessant spy game.

Memorial

"All I can think of is that I had worked on the memorial (for the victims of the bombings) and so that is quite possible because some of it was quite secret at the time. But I have no other idea," mused Mr Cassidy.

He also had a good relationship with the newspaper and had co-operated with them on several occasions.

Ciaran (22) was killed on a packed London Underground train on the Piccadilly Line along with 26 other people. The bomb was detonated by 19-year-old Jermaine Lindsay.

At the time of his death, he had been working for a printing and stationary company. During his inquest, his mother Veronica noted that he had studied leisure and tourism and that he loved talking about football with anyone who would listen.

"They (the police) said that they would be in touch with us again in a few weeks time," said Mr Cassidy, explaining how everything is still a mystery.

"This will be a big deal over here; it's on in parliament at the moment, it won't die down.

"But the 'News of the World' and 'The Sun' both back the Tories. They are too close at the moment; that is why the Tories won (the last election). No one wants to get on the wrong side of Rupert Murdoch."